Liquid cooling device and projection device

Abstract

A liquid cooling device includes a first liquid cooling row having a first inflow end and a first outflow end for liquid to flow in a first direction, a second liquid cooling row having a second inflow end and a second outflow end, and a fan. The second liquid cooling row is disposed opposite to the first liquid cooling row. The second inflow end is connected to the first outflow end for the liquid flowing out from the first outflow end to flows in a second direction opposite to the first direction. Airflow generated by the fan sequentially flows through the second and first liquid cooling rows to cool the liquid. A projection device having the liquid cooling device is also provided.

What is claimed is: 
     
         1 . A liquid cooling device, comprising: a first liquid cooling row, a second liquid cooling row, and a fan, wherein
 the first liquid cooling row has a first inflow end and a first outflow end for liquid to flow from the first inflow end to the first outflow end in a first direction;   the second liquid cooling row is disposed opposite to the first liquid cooling row, the second liquid cooling row has a second inflow end and a second outflow end, the second inflow end is connected to the first outflow end for the liquid flowing out of the first outflow end to flow from the second inflow end to the second outflow end in a second direction, wherein the first direction is opposite to the second direction; and   the fan is adapted to generate airflow, and the airflow sequentially flows through the second liquid cooling row and the first liquid cooling row to cool the liquid.   
     
     
         2 . The liquid cooling device according to  claim 1 , wherein the first liquid cooling row comprises a plurality of first liquid cooling tubes arranged at intervals, each of the plurality of first liquid cooling tubes extends in the first direction, the second liquid cooling row comprises a plurality of second liquid cooling tubes arranged at intervals, each of the plurality of second liquid cooling tubes extends in the second direction, and the plurality of first liquid cooling tubes are respectively opposite to the plurality of second liquid cooling tubes. 
     
     
         3 . The liquid cooling device according to  claim 2 , wherein the first liquid cooling row further comprises a plurality of first heat dissipating elements connected between the plurality of first liquid cooling tubes, and the second liquid cooling row further comprises a plurality of second heat dissipating elements connected between the plurality of second liquid cooling tubes. 
     
     
         4 . The liquid cooling device according to  claim 3 , wherein the plurality of first heat dissipating elements and the plurality of second heat dissipating elements comprise a plurality of heat dissipating fins. 
     
     
         5 . The liquid cooling device according to  claim 2 , wherein the plurality of first liquid cooling tubes and the plurality of second liquid cooling tubes comprise a plurality of flat tubes. 
     
     
         6 . The liquid cooling device according to  claim 2 , wherein
 the first liquid cooling row further comprises a first header tank and a second header tank, the plurality of first liquid cooling tubes are connected between the first header tank and the second header tank, the first header tank has the first inflow end, and the second header tank has the first outflow end; and   the second liquid cooling row further comprises a third header tank and a fourth header tank, the plurality of second liquid cooling tubes are connected between the third header tank and the fourth header tank, the third header tank has the second inflow end, and the fourth header tank has the second outflow end.   
     
     
         7 . The liquid cooling device according to  claim 1 , wherein the first liquid cooling row and the second liquid cooling row are separated by a predetermined distance. 
     
     
         8 . The liquid cooling device according to  claim 1 , further comprising a liquid conduit, wherein the liquid conduit is connected between the first outflow end and the second inflow end. 
     
     
         9 . A projection device, comprising: an illumination system, a light valve, a projection lens, and a cooling system, wherein the illumination system comprises a light source, the light source is adapted to provide an illumination beam, the light valve is disposed on a transmission path of the illumination beam to convert the illumination beam into an image beam, the projection lens is disposed on a transmission path of the image beam, and the cooling system comprises a liquid cooling device, at least one heat absorbing element, and a liquid conveying pipeline, wherein
 the liquid cooling device comprises a first liquid cooling row, a second liquid cooling row, and a fan, wherein
 the first liquid cooling row has a first inflow end and a first outflow end for liquid to flow from the first inflow end to the first outflow end in a first direction; 
 the second liquid cooling row is disposed opposite to the first liquid cooling row, the second liquid cooling row has a second inflow end and a second outflow end, and the second inflow end is connected to the first outflow end for the liquid flowing out of the first outflow end to flow from the second inflow end to the second outflow end in a second direction, wherein the first direction is opposite to the second direction; and 
 the fan is adapted to generate airflow, and the airflow sequentially flows through the second liquid cooling row and the first liquid cooling row to cool the liquid; 
 the at least one heat absorbing element is connected to at least one of the light source and the light valve, and the heat absorbing element has a liquid inflow end and a liquid outflow end; and 
 the liquid conveying pipeline is connected in series with the heat absorbing element and the liquid cooling device, wherein the liquid flowing out from the second outflow end flows into the heat absorbing element through the liquid conveying pipeline and the liquid inflow end and flows into the first inflow end through the liquid outflow end and the liquid conveying pipeline. 
   
     
     
         10 . The projection device according to  claim 9 , wherein the cooling system further comprises a pump and a liquid storage tank, and the liquid conveying pipeline is also connected in series with the pump and the liquid storage tank. 
     
     
         11 . The projection device according to  claim 10 , wherein the first liquid cooling row comprises a plurality of first liquid cooling tubes arranged at intervals, each of the plurality of first liquid cooling tubes extends in the first direction, the second liquid cooling row comprises a plurality of second liquid cooling tubes arranged at intervals, each of the plurality of second liquid cooling tubes extends in the second direction, and the plurality of first liquid cooling tubes are respectively opposite to the plurality of second liquid cooling tubes. 
     
     
         12 . The projection device according to  claim 11 , wherein the first liquid cooling row further comprises a plurality of first heat dissipating elements connected between the plurality of first liquid cooling tubes, and the second liquid cooling row further comprises a plurality of second heat dissipating elements connected between the plurality of second liquid cooling tubes. 
     
     
         13 . The projection device according to  claim 12 , wherein the plurality of first heat dissipating elements and the plurality of second heat dissipating elements comprise a plurality of heat dissipating fins. 
     
     
         14 . The projection device according to  claim 11 , wherein the plurality of first liquid cooling tubes and the plurality of second liquid cooling tubes comprise a plurality of flat tubes. 
     
     
         15 . The projection device according to  claim 11 , wherein
 the first liquid cooling row further comprises a first header tank and a second header tank, the plurality of first liquid cooling tubes are connected between the first header tank and the second header tank, the first header tank has the first inflow end, and the second header tank has the first outflow end; and   the second liquid cooling row further comprises a third header tank and a fourth header tank, the plurality of second liquid cooling tubes are connected between the third header tank and the fourth header tank, the third header tank has the second inflow end, and the fourth header tank has the second outflow end.   
     
     
         16 . The projection device according to  claim 9 , wherein the first liquid cooling row and the second liquid cooling row are separated by a predetermined distance. 
     
     
         17 . The projection device according to  claim 9 , wherein the liquid cooling device further comprises a liquid conduit connected between the first outflow end and the second inflow end.